United States. Dept. of Agriculture. Economic Research Service, United States. World Agricultural Outlook Board, & United States. World Food and Agricultural Outlook and Situation Board. (1981). World agriculture outlook & situation. The Service.
Chicago-referens (17:e uppl.)United States. Dept. of Agriculture. Economic Research Service, United States. World Agricultural Outlook Board, och United States. World Food and Agricultural Outlook and Situation Board. World Agriculture Outlook & Situation. [Washington, D.C.]: The Service, 1981.
MLA-referens (8:e uppl.)United States. Dept. of Agriculture. Economic Research Service, et al. World Agriculture Outlook & Situation. The Service, 1981.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.